Concept of E.on Netz for Offshore Grid Connections

7/25/2019 Concept of E.on Netz for Offshore Grid Connections

1/33

1

Concept of E.ON Netz for

offshore grid connections

Our Offshore activities

NetzOffshore

David ScharteWaddensea Forum 19. Fan 2008

Seite 2Waddensea Forum Fanoe November 2008

Content

Offshore grid connections background

How many windfarms have to be connected when and where?

How shall we do it?

Projects in 2007 till 2009

Crossing Norderney

The first wind park Alpha Ventus

The first grid connection: NordE.ON 1 for cluster Borkum 2


2/33

2


Offshore grid connections where we stand now

In Germany we have ambitious political goals concerning wind power. The

idea of German politicians is to install round about 1.5 GW until 2011, but

no German offshore windfarm up to now

What to do?

The politicians are seeking acceleration of offshore-process and this

resulted in a new law based on 17 Abs. 2a EnWG :

was signed on 17th of December in 2006

called Infrastrukturplanungsbeschleunigungsgesetz


TSOs responsible for offshore grid connections and the TSO bears the costof the grid connection

completion of the connection to the grid must coincide with the end ofconstruction of the wind farm

the investment & operation cost to be shared between the four GermanTSOs and to be part of price regulation

the connection must be cost effective and operationally efficient

the obligation for TSOs applies to all wind farms going into operation

before end of 2011 (now till 2015 with the new amendment since June

2008)

with this amendment the feed in tariff for offshore wind energy into

German grid will be increased from 13 ct/kWh to 15 ct/kWh

Offshore grid connections - a new legal task for E.ON Netz

TSO = Transmission System Operator


3/33

3


Estimated transmission capacity

Federal Government: 10.000 MW(until 2020)up to 25.000 MW(until 2030)

Dena: 20.400 MW (until 2020)

Requested wind parks (as at November 2008)

North Sea: >50 (17 approved) EEZ (Exclusive Economic Zone)

2 12-Mile-Zone

Baltic Sea: 5 EEZ

4 12-Mile-Zone



4/33

4


How many wind farms want to be connected when/where?

planned installing wind farm capacity is constrained by:- availability of relevant components and facilities- ability to obtain regulatory approvals (planning, permits etc.)

E.ON Netz must perform a realistic assessment of the installed offshoregeneration capacity over time in order to match transmission capacity to it


Criteria to validate the date of the operation of a wind

farm

BSH- bzw. BImSchG-Approval

Detailed time schedule of the wind farm build up

Orders of the components (turbines, grounding structure andtransformer station)

Assurance of the financing of the wind farm


5/33

5


How shall we do it? at first every OWP planned his own connection to the grid

the result: 14 individual cable links with no coordination

it was neither practical nor efficient


Implementing the cluster concept: HVDC connections

Landing point Grid

Link to the grid

Property wind park Property E.ON Netz

Property wind park B

Wind mills

AC

DC

DC

AC

Wind mills

Property wind park A

AC SS

PlatformE.ON Netz

Converter Converter


6/33

6


Cluster concept for further distanced connections, a technical

connection concept developed by E.ON Netz Offshore

Offshore wind parks (OWP) are combined in clusters and

connected by one common cable system

High-capacity North Sea power socket via expandable HVDC

connections (HVDC= high voltage direct current)

Economic an environmental advantage: minimizing offshore- and

onshore routes and use of powerful offshore HVDC cables whichmanage large transmission capacity

How shall we do it? With modular clustered connection


How shall we do it?

individual connections

Landing point

Windpark

platform

Wind mills

Grid

Link to the grid

Property wind park Property E.ON Netz

Implementation keys for offshore grid connection

Coastal area: individual connections by 110-kV-AC cable


7/33

7


An overview: cluster / alpha ventus

BoardersContinental shelf /exclusive economic zone(200 nautical miles)

Territorial Waters / 12mile zone

International Boarder

Offshore wind parksAuthorizedPlannedCluster connectionAlpha ventus


Availability of required material

Just three offshore cable producers in all Europe

Currently no 300-kV cable available (expected to be available in 2010/11)

No mass production until 2011

220-kV-AC offshore cable not yet available

150/200-kV-DC offshore cable: max. production of 100 km per annum

Converter Siemens: project pilot TransBay 2009 no further production

capacity

Converter ABB: state of the art but long delivery times

Converter AREVA: merely HVDC classic available, not HVDC light

Heavy lifting and transportation: capacities for platform mounting are

booked up in the long term


8/33

8


Formation in May 2007

Ca 35 staff members, supported by the staff of E. ON Netz

Increasment to approx. 70 staff members in the next years

Who is doing it ? ENEO der E.ON Netz Offshore


Organisation of ENEO?

Projectcoordination

Projcts Technical Approvals Commercial Operation*

Support/Services from E.ON Netz GmbH

Geschftsfhrung

Assistenz TechnischSchulze Wischeler

KaufmnnischFricke

*noch auszugestalten


9/33

9

Crossing Norderney


Crossing the island Norderney

HVDC cable laying

Offshore cable laying

Onshore cable laying inempty ducts

HDD-drilling points anddirections

Levees


10/33

10


Onshore cable laying via empty duct construction

Empty duct with 35 conduitsBuilding activities (Norderney spring 2008)


The cradle of the connection points for the wind farmsin the North Sea

a parking area on the beach of Norderney


11/33

11

Individual connection of alpha ventus


The wind park alpha ventus

The first German offshore wind park: offshore test field alpha ventus

Operators = DOTI (Deutsche Offshore Testfeld Infrastrukturgesellschaft),existing with subsidiaries from Vattenfall, EWE and E.ON

Initial generating capacity: 60 MW (12 x 5 MW) (now in 2009)

Wind mill producers are Multibrid and REpower

Grid connection: implementation as individual AC-connection of the 110-kV- transmission line Norddeich-Esens/ Damsum

New construction of the transformer station Hagermarsch


12/33

12


Alpha Ventus(E.ON Netz Offshore)

UW Hagermasch

Leerrohrbauwerk Norderney

Alpha Ventus


The Grid connection for alpha ventus

cable route offshore:

54,2 km on the sea

4,9 km in the tideland between island and mainland

cable route onshore: 1,5 km on Norderney

4,5 km up to the transformer station Hagermarsch


13/33

13


Schedule of building measures regarding alpha ventus

2007: Four horizontal directional drillings for alpha ventus 1,5 km empty ducts built on Norderney until April 2008

2008: New construction of the transformer station Hagermarsch Cable bushing through empty ducts at Norderney Laying of the cable route onshore, connection of the transformer station

Hagermarsch

Laying of the cable route offshore Connection of the on- and offshore cables including final checking Commissioning of the cable route onshore and of the transformer station

Hagermarsch


Crossing the island Norderney

HVDC cable laying


Onshore cable laying inempty ducts

HDD-drilling points anddirections

Levees


14/33

14


Crossing Levees via horizontal directional drilling (HDD)

horizontalbohrung.exe

Phase 1:Pilot drilling

Phase 2:

Broaching

Phase 3:Cable bushing


Horizontal directional drilling for alpha ventus (2007)


15/33

15


Transformer station Hilgenriedersiel (June / August 2008)


Offshore-cable/ AC 110 kV (exemplary)

Three-phase XLPE (cross-linked

polyethylene) cable with fiber optics for

steering and monitoring the windmills

of the offshore transforming station

Relevant data:

110 kV, 3 x 240mm Cu

Weight: approx. 53 kg/m

External diameter: approx. 18 cm


16/33

16


Offshore cable at the producer Prysmian in Naples (July 2008)

Approximately 60kilometer cable forthe offshore cablelaying


Giulio Verne & operational platform (July 2008)


17/33

17


Rewinding of the offshore cable from Giulio Verne to the

operational platform (end of July 2008)

Offshore cable fortideland laying


Vessels for laying and operational platform

Team Oman86 x 24 m

CLB Ocean Team Installer65 x 22 m

Combifloat48 x 42 m


18/33

18


Ocean Trencher 01 milling cutter on the operational

platform

Milling cutter forthe cable layingin the mud flats

Seite 36Waddensea Forum Fanoe November 2008picture: H.W. Linders, ecoplan, Leer


19/33

19


picture: H.W. Linders, ecoplan, Leer




20/33

20




Rewinding of 3,5 km offshore cable: from Team Oman to

Ocean Team Installer


21/33

21


Sword to flush in the cable into the grounds in shallow

water areas (north of Norderney on Ocean Team Installer)


Oceanjet 200 for the offshore cable laying deeper as 10

meter (on the vessel Team Oman)


22/33

22


Offshore Cable laying: Team Oman / cable flushing carriage



Cables are laid directly on the ocean bed

Threat of damage, if cables are not protected

Main jeopardy are trawls

Therefore, cables have to be flushed into the ground. Different demandfor different techniques: Cables are being milled in the tideland and

flushed in the sea using a flushing sword or a carriage slide


23/33

23


Monitoring concept

supervision of the construction by a nature conservation expert

Monitoring of the development after the construcction and during

operation

Monitoring of compensation measures


Design of infauna monitoring

Arial surveys



24/33

24


Temperature Monitoring during operation

Quellen: BfN, Ifa


Compensations- und Coherence measuresDeconstruction of an old harbour on Spiekeroog


25/33

25

Seite 49Waddensea Forum Fanoe November 2008Concept byHW Linders, ecoplan, Leer, Germany

Cluster connection Borkum 2


26/33

26


UW Diele

Leerrohrbauwerk Norderney

NordE.ON1 for

Cluster Borkum 2(E.ON Netz Offshore)

Windpark-ClusterBorkum 2


First wind park expected to be ready for operation in September 2009

First HVDC system linking an offshore-Windpark and the extra high

voltage grid

Platform

Approx. 120 km cable offshore

Approx. 75 km cable onshore

Grid connection: transformer station Diele

Turn key contract with ABB (signed September 2007)

Value: > 300 Mill.

First project NordE.ON 1 for the connection of the ClusterBorkum 2


27/33

27


2007: 1,5 km empty ducts built on Norderney until April 2008 Conduits used for several projects

2008:

eight HDDs on Norderney and Hilgenriedersiel for NordE.ON 1

Fall: Cable bushing for NordE.ON 1 through the empty ducts at Norderney

37,5 km onshore cable laying for NordE.ON 1 incl. crossing the river Ems

2009: Enlargement of the transformer station Diele Remaining cable laying onshore (37,5 km) Cable laying offshore (120 km) Connection at the transformer station Diele

Schedule of building measures regarding Borkum 2


380-kV-Umspannwerk Diele


28/33

28


UW Diele- Konvertergebude

Baustart Fundamente Konverter und Trafo: August 2008

Stahlrahmenkonstruktion mit PaneelbekleidungAbmessungen 74 x 38 x 14m


Onshore route Hilgenriedersiel Diele

Length 75 km

2008

Cable laying in the administrative district Aurich (37,5 km)

and crossing of the river Ems

2009

Cable laying in the administrative district Leer (37,5 km)


29/33

29


Trassenquerschnitt EC Trasse Nord und Querverbindung


Onshore Kabel HG Light

Spannung +-150 kV

Leistung 400 MW

Leitermaterial Aluminium

Leiterdurchmesser 55,8 mm

Leiterquerschnitt 2300 mm Kabeldurchmesser 98,4 mm

Gewicht 11,5 kg/m

Lieferlnge 750 m


30/33

30


Cable laying onshore / Georgsheil June 2008

Construction work in the

administrative district Aurich


HDD in the tideland - alpha ventus and NordE.ON1


31/33

31


Offshore-cable / HVDC light

HVDC = High voltage direct current

Modal performance:

150 kV, 1200 mm Cu

400 MW

weight approx. 30 kg/m

approx. 10 cm

Offshore laying in 2009


400 MW offshore converter station

Measures: 54x35x25 m

Weight of top side: approx. 3000 t

Weight of jacket: approx. 2000 t

Water depth: 40 m

Height of the jacket: 60 m


32/33

32


The HVDC platform an offshore transformer station

Foundation mounted in the North Sea

Top site is piled up with so called heavy lifting equipment


Crane for anchoring the platform (heavy lifting)


33/33

Thank you very much for yourattention !!!

NetzOffshore

Waddensea Forum 19. Fan 2008

Date post:	28-Feb-2018
Category:	Documents
Upload:	jack
View:	225 times
Download:	0 times

Concept of E.on Netz for Offshore Grid Connections

Documents